Transparent pockets. They are thick and sturdy, making it easy to stick stickers on! (Although not a hard type, they are not thin and flimsy, but rather a thick and sturdy type) Since it's a 1-pocket type, you can store stickers with the backing sheet attached! The size is A7. 6-hole type. Can be inserted into a binder. A7 size binders are also available, so bulk purchases are also OK! Sticker book refill Sticker backing paper Sticker notebook Bonbon Drop Stickers Puffy stickers 3D stickers